Extraction of Iron(II)-Tris(1,10-phenanthrolinato) Chelate into the Polymer Phase Formed from an Aqueous Solution of Poly(N-isopropylacrylamide)
Extraction of Iron(II)-Tris(1,10-phenanthrolinato) Chelate into the Polymer Phase Formed from an Aqueous Solution of Poly(N-isopropylacrylamide)
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将铁(II)-三(1,10-菲咯啉)螯合物萃取到由聚(N-异丙基丙烯酰胺)水溶液形成的聚合物相中
DOI：
10.2116/analsci.13.1
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发表时间：
1997
影响因子：
1.6
通讯作者：
C. Matsubara
中科院分区：
文献类型：
--
作者：
T. Saitoh;T. Ohyama;K. Takamura;T. Sakurai;Toshikazu Raise;C. Matsubara
当将水溶性聚合物聚（N -异丙基丙烯酰胺）（PNIPAAm）的水溶液加热到32 ℃以上时，聚合物变得不溶，然后形成具有非常小体积分数的糊状沉淀物（聚合物相）。一种水溶性的阳离子螯合物，铁（II）-三（1，10-菲咯啉）[Fe（phen）_3]^2+，作为与高氯酸盐的离子对被很好地萃取到聚合物相中。基于水相和聚合物相的体积分数，所评价的离子对的对数分布常数为2.53±0.05，预示着离子对的浓缩的高效率。根据聚合物相中1-（4-羟基苯基）-2，4，5-三苯基吡啶氢氧化物内盐和1-乙基-4-羧基甲氧基吡啶碘化物的光谱，PNIPAAm相的极性参数E _T（1）和Kosower Z值分别为257和333 kJ mol^-1。这些结果表明，聚合物相的溶剂性质对应于醇类溶剂，如甲醇或乙醇。[Fe（phen）_3]^2+（ClO_4-）_2离子对的高萃取性归因于聚合物相的极性性质。
When an aqueous solution of a water-soluble polymer, poly( N -isopropylacrylamide) (PNIPAAm), was heated above 32° C, the polymer became insoluble, and then formed paste-like precipitates (polymer phase) having a very small volume fraction. A water-soluble cationic chelate, iron(II)-tris(1,10-phenanthroline) [Fe(phen)_3]^2+, was well extracted into the polymer phase as the ion-pair with perchlorate. On the basis of the volume fractions of the aqueous and polymer phases, the logarithmic distribution constant of the ion pair evaluated was 2.53±0.05, promising high efficiency in the concentration of the ion pair. Based on the spectra of 1-(4-hydroxyphenyl)-2,4,5-triphenylpyridinium hydroxide inner salt and 1-ethyl-4-carboxymethoxypyridinium iodide in the polymer phase, the polar parameters, E _T(1) and Kosower’s Z values of the PNIPAAm phase were 257 and 333 kJ mol^-1. These results suggest that the solvent properties of the polymer phase correspond to those of alcoholic solvents, such as methanol or ethanol. The high extractability of the [Fe(phen)_3]^2+(Cl0_4-)_2 ion pair was ascribable to the polar properties of the polymer phase.